TRENDS IN MODELLING SUPPLY CHAIN AND LOGISTIC NETWORKS
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1 Advanced OR and AI Methods in Transportation TRENDS IN MODELLING SUPPLY CHAIN AND LOGISTIC NETWORKS Maurizio BIELLI, Mariagrazia MECOLI Abstract. According to the new tendencies in marketplace, such as the growth and spread of e-commerce and e-business, Supply chains and Logistics are naturally being modeled as distributed systems. Companies are organized as Demand and Supply network and the global logistics system is performed by a large-scale world-wide network of local service enterprises. Referring to such scenario, multiagents and operations research approaches in modelling classical and new complex problems are reviewed and illustrated. Operation Research techniques for centralized optimization are discussed with reference to classical resource allocation and workflow problems. 1. Introduction Current scenario in production and logistic fields shows globalization, needs for increasing quality of goods, rapid changing in market demand, customer-service policies, flexibility of production processes, e-business and e-commerce. An increasing number of companies is adopting the supply chain organization methodology in order to improve the competitiveness and profitability. These companies are organized as Demand and Supply network through which raw materials are acquired, transformed into products and delivered to customers. The supply chain is a complex network of organizations (enterprises devoted to manufacturing, purchasing, distribution, marketing, etc.) with different and conflicting objectives, which can be essentially organized in two different ways. It can be controlled by a central partner (company) which is dominant respect to the other components of the supply chain in taking decisions. While, a second type of organization defines the supply chain network as a distributed system composed by several parallel and independent agents, and management consists of guaranteeing the coherence between the different decision making centers (agents). In this case, crucial is to assure collaboration among partners (companies, agents) and main problems concern the integration of the actors, the re-engineering of business processes, the dynamic coordination of demand and supply, and the improvement of the Istituto di Analisi dei Sistemi ed Informatica Antonio Ruberti CNR, Roma. bielli@iasi.cnr.it
2 148 M. Bielli, M. Mecoli total logistic chain performances. Many European projects found application in such area; for instance, CO-DESNET, that will be described in detail in the following, aims to create a large-scale collaborative network of production and service enterprises operating within a common industrial sector sharing management problems. In a supply chain model, a functional sub-system is represented by the Logistics network. The global logistics system is performed by a large-scale world-wide network of local service enterprises, each one devoted to receive and distribute loads according to specific prescriptions of clients. Thus, the system we refer to is a production and distribution logistics network, where a flow of goods is delivered from suppliers to producers and to customers. Then, logistics networks consist of many loosely connected heterogeneous sets of actors, such as suppliers, factories, production firms, warehouses, distribution companies, transport and service providers, retailers, customers and so on. An efficient logistic management is becoming very important due to the development and quick growth of e-logistic and e-commerce. Many kinds of logistics management models have been proposed and implemented; while traditional integration is based on the centralized mindset, in recent years researchers have proposed a large number of Multi-agent based models. 2. European Projects In this scenario framework, several European projects funded by European Commission have been carried out in the fields of supply chain management and logistics networks (see [2]). BPR-LOGISTICS project addressed the business, policy and research implications of logistics in the e-economy environment with the analysis of emerging technology trends, emerging market requirements and impacts evaluation of business environment on supply chain systems. SULOGTRA project concerned the effects on transport of trends in logistics and supply chain management and investigated logistic decision-making processes and their impact on freight transport requirements. TRILOG EUROPE analysed the global logistics trends by a Delphi survey of an expert panel on future logistics and freight transport developments. EDRUL project investigated, developed and validated an innovative information platform, and the supported service/business models, for improved management of freight distribution and logistics processes in urban areas. LOGICAT project aimed at formulating an overall strategy to further develop logistics of competitive external and internal trades of the European states by using fully integrated intermodal systems. Moreover, a study of e-commerce effects on logistics and supply chain management was carried out. SMILE (Strategic Model for Integrated Logistic Evaluation) is a DSS developed in Netherlands to describe logistics chains, to design scenarios and simulate impacts of policy measures on freight flows and the environment [12]. Moreover, the European Co-ordination Action CO-DESNET aims to promote the diffusion of the European scientific knowledge on the problem of designing and managing large-scale multi-functional multi-agents Collaborative Demand & Supply Networks, i.e. large-scale networks of production, logistics and service enterprises operating within a common industrial sector. In particular, main activities carried out consist of exchange and dissemination of study reports and research results, setting up of a common information system dedicated to design and management issues, tools, procedures, performances evaluation and best practices in supply chain and logistics
3 Trends in modelling supply chain and logistic networks 149 fields. Therefore, a Virtual Library was organised in order to collect scientific papers and solution procedures, arranged in a clear and simple format. Then, a Virtual Laboratory provides a benchmark of district and supply chain worldwide realities, by presenting an aggregate analysis of their financial and economic situations, the operational structures, the organisational arrangements, the interactions with the socio-economic environment and the expected development, with the specification of several performance indicators [1]. 3. Multi-agents modelling The innovation in supply chain management, logistics and distribution systems design reflects the general tendency of increasing interest towards cooperative Multi-Agent Systems (MAS) within large-scale distributed organizations. In fact, MAS are well suited to representing problems that have multiple perspectives and problem solving entities. They are systems consisting of a number of agents that act with a given degree of autonomy and are able to interact with one another. Each autonomous agent operates in a dynamic environment without any external intervention, it can interact with other agents in coordination, cooperation or negotiation, it has some kind of control over its actions and internal state, it has own mission and decision-making capabilities. Agents must realize a set of goals or tasks in order to maximize local profit or efficiency (they are able to map their own inputs to output to maximize their utility) and the decisions they take have to be coordinated and directed towards the global goal of the system. The aim is thus of designing a model where the local operational performance criteria should be related to the overall level performance goals for the network as a whole. As a consequence, the interest toward a distributed management organization is increasing, where a complex network is managed by a unique center. Therefore, the question is how to derive overall profitability and stability through the distributed individual decisions. In fact, the main resistance against decentralization depends on the doubt about the capacity of a multi-agents organization to assure a high efficiency to the whole system. In practice, in decentralizing management of a large-scale system, as a world-wide logistics network is, top managers ask if when the local autonomy increases, also the global efficiency of the whole system can increase. In order to analyse and discuss this topic, the problems of decentralized production management organization with coordination or cooperation of local autonomous agents are discussed in [4, 13], by analysing the properties and relationships among overall efficiency, effectiveness of the coordination, autonomy and efficiency of local cooperative agents. So far, the mainstream research in management of general supply chains with multiagent systems is based on functional agents (an agent type for each different task) and has tackled mainly the communication,cooperation and integration issues of those agents. Few works solve the supply chain as a distributed optimization problem [10]. A large part of literature on MAS deals with simulating and analyzing behavior of such system under particular assumptions [14]. Other viewpoints refer to logical models of agents seen as qualitative decision-makers (see [5]), or to the discussion of negotiation and cooperation issues ([6]), or the formulation of the problem in a game theoretic context [3]. Research in some cases is also directed in developing Optimization models that make use of different
4 150 M. Bielli, M. Mecoli Operations Research techniques. 4. Operations Research and Management Science models Operations Research (OR) and Management Science (MS) disciplines provide several analytical tools, mathematical models and computational techniques to analyse and optimise the performances of logistic processes and of the entire logistic chains from several perspectives and objectives for each level of decision (strategic, tactical, operational). Then, they are potentially effective tools in simulation, evaluation and decision support. A wide overview of classical OR models and techniques suitable for different logistic activities and supply chains has been presented and discussed in [8] and [11], according to the classification in deterministic, stochastic, hybrid and Information Technology - driven models. The decision variables considered concern facilities location, resources allocation, network structuring, time scheduling, volumes and inventory levels while constraints deal with capacity, service requirements, customer demands, etc. However, the wide development of mathematical programming, optimisation, simulation and heuristics, able to address well structured issues, has been completed by forecasting models, multi-attribute evaluation, game theory, negotiation models, fuzzy logic, model-based DSS, artificial intelligence and knowledge management techniques. Different solution approaches refer to optimization techniques as well as constraint programming and stochastic programming, which has the advantage of handling the dynamicity and the uncertainty of the system. The optimization techniques used to model distributed system refer to high complex large-scale optimization problems and efficient algorithms to solve them usually deploys the advantage of decomposition approaches. Such approaches consist in decomposing the main problem into easy-to-solve sub problems, each of which essentially refers to a specific agent; they use dual prices of resources to coordinate the different plans generated in the different sub-problems. Among these, the Lagrangian relaxation uses Lagrangian multipliers which are referred as dual prices to relax constraints. In a decomposition approach a coordination problem (master problem) and the sub-problems are solved interchangeably (all the sub-problems in parallel). Where the role of the master problem is to find the best solution given the sub-problem solutions generated so far. Then, it will generate new dual prices to be communicated to the sub-problems. The master problem and the sub-problems are iteratively solved until the process converge and no improving solutions can be found. An open problem (see [4]) which involves such approach deals with the evaluation of the efficiency of the distributed system in comparison with a centralized system. Where the efficiency may be measured in terms of optimum obtained after the optimization process; thus the comparison is made between the local (agents ) and the global (system ) optima. Figure 1 illustrates the main steps of such approach. In particular, as regards the resource allocation problem for intra-organizational logistic management, multi-agents have been employed to realize the Lagrangian relaxation technique, where each sub-problem is solved by a specific agent by exchanging information with other agents until a near optimal solution is found [9]. The application domain characteristics suitable for the two categories of approaches so
5 Trends in modelling supply chain and logistic networks 151 Figure 1. Lagrengean technique to evaluate global versus local efficiency in a distributed optimization system. far presented have been identified and discussed in [7] by comparing problem size, modularity, integrity, quality of solution with respect to computational complexity, robustness, ability to find optimal solutions and so on. Moreover, a number of promising ways of combining an agent-based approach and optimization techniques into a hybrid approach (or a close integration) have been illustrated. 5. Conclusions The evolution of supply chain and logistics networks reflects the increasing interest towards decentralized Multi-Agent Systems which is pointing out the necessity of evaluating and modelling efficient management and coordination tools. As a responce to this active research area, many technologies have been proposed and implemented covering different fields which include optimization, simulation, agent technologies, descriptive models or data mining. The aim of this work is to give a survey of such appraches and to point out
6 152 M. Bielli, M. Mecoli new open problems and requests of such decentralized systems. In this sense, crucial an efficient integration of such technologies and the development of quantitative solution procedure, possibly employing optimization techniques, in order to get to a proper coordination of the systems. References [1] Co-desnet web site : [2] [3] R. Axelrod, editor. The evolution of cooperation. Basic Booka, [4] M. Bielli, M. Mecoli, and A. Villa. Autonomy versus efficiency in management of large-scale logistic networks. In Proceedings of the 16th World IFAC Conference, Prague, [5] R. Brafman and M. Tennenholz. Modeling agents as qualitative decision makers. Artificial Intelligence, 94(1 2): , [6] T.-T. Dang, B. Frankovic, and I. Budinska. The multi-agent approach to supply chain management optimization. Acta Electrotechnica et Informatica, 93(4):5 12, [7] P. Davidsson and F. Wernstedt. A framework for evaluation of multi-agent system approaches to logistics network management. In Multi-Agent Systems: An Application Science. Kluwer, [8] H. Min and G. Zhou. Supply chain modeling: past, present and future. Computers and Industrial Engineering, 43(1 2), [9] E. Santos and F. Zhang. Intra-organizational logistics management through multiagents systems. Electronic Commerce Research, 3(1 2): , [10] C. Silva, J. C. Sousa, J. S. da Costa, and T. Runkler. A multi-aget approach for supply chain management using ant colony optimization. In Proceedings of the 2004 IEEE International Conference on System, Man and Cybernetics, The Hague, The Netherlands, [11] P. Slats, B. Bhola, J. Evers, and G. Dijkhuizen. Logistic chain modelling. European Journal of Operation Research, 87:1 20, [12] L. Tavasszy, B. Smeenk, and C. Ruijgrok. A dss for modelling logistic chains in freight transport policy analysis. Int. Trans. Opl. Res., 5(6): , [13] A. Villa. Autonomy versus efficiency in multi-agents management of extended enterprices. Journal of IntelligentManufacturing, 13: , [14] G. Wagner and F. Tulba. Agent-oriented modeling and agent-based simultion. In Springer-Verlag, editor, Proceedings of 5 th Int. Workshop on Agent-oriented information systems, 2003.
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